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Ionization and Dissociation of Benzene and Aniline under deep ultraviolet laser Irradiation

Chinese Journal of Chemical Physics 2020年第5期33卷 583-589,I0014-I0028,I0078,I0079页

作者： Lijun Geng Hanyu Zhang Haiming Wu Zhendong Sun Zhixun Luo School of Physics Shandong UniversityJi'nan 250100China Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Physics and Electrical Engineering Kashi UniversityKashgar 844006China

We report a study on photo-ionization of benzene and aniline with incidental subsequent dissociation by the customized reflection time-of-flight mass spectrometer utilizing a deep ultraviolet 177.3 nm *** efficient ionization of benzene is observed with a weak C4H3+fragment formed by undergoing disproportional C-C bond *** comparison,a major C5H6+·fragment and a minor C6H6+·radical are produced in the ionization of aniline pertaining to the removal of CNH·and NH·radicals,***-principles calculation is employed to reveal the photo-dissociation pathways of these two molecules having a structural difference of just an amino *** is demonstrated that hydrogen atom transfer plays an important role in the cleavage of C-C or C-N bonds in benzene and aniline *** study is helpful to understand the underlying mechanisms of chemical bond fracture of benzene ring and related aromatic molecules.

关键词： Photo-dissociation Mass spectrometry Benzene Aniline deep ultraviolet laser C-C bond activation

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Selective Dehydrogenation of Diaminobenzenes by deep ultraviolet Single Photons

Selective Dehydrogenation of Diaminobenzenes by Deep Ultravi...

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第十五届全国化学动力学会议

作者：吴海铭 Zhixun Luo State Key Laboratory for Strucutral Chemistry of Unstable and Stable species Institute of ChemistryChinese Academy of Sciences

Single-photon ionization mass spectrometry(SPI-MS) is known as an important technique available for chemical identification because organic molecules are readily fragmented under usual laser radiation.1 The use of deep ultraviolet(DUV) radiation takes advantages for SPI-MS especially for the compounds with ionization potentials below the energy of a single DUV *** 177.3-nm all-solid-state DUV laser single-photon ionization based on our customed time-of-fight mass spectrometer(TOF-MS) system has a unique advantage in distinguishing diaminobenzenes isomers which possess ionization energies close to 7.0 eV. The reasonable performance is attributed to the synergistic effect of short pulse duration,high single photon energy,and high photon flux of the all-solid-state DUV laser and distinguishing merits of *** is found that the dramatic selectivity of diaminobenzenes isomers pertains to varied photochemical processes initiated by the DUV laser radiation.A single-photon ionization process dominates for 1,4-diaminobenzene(PPD) resulting in a fragmentation-free mass spectrum;photo-induced dehydrogenation is observed for 1,2-diaminobenzene(OPD) and 1,3-diaminobenzene(MPD).The dramatic intensity ratio of the molecule parent ion relative to its dehydrogenation fragment reveals selective C-H activates under the DUV single photons.

关键词： deep ultraviolet laser time-of-fight mass spectrometer diaminobenzenes isomers single photon ionization

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